Ensure title shows correctly for doc pages

docs/blocks/variables.md

@@ -1,4 +1,4 @@
-## Variables
+# Variables
 
 [Assign](/blocks/variables/assign) (set) a variable's value
 

docs/js/sequence.md

@@ -1,4 +1,4 @@
-## Sequencing commands
+# Sequencing commands
 
 By calling one function after another, you can create an animation:
 

docs/reference/types/string-functions.md

@@ -1,3 +1,3 @@
-## String functions
+# String functions
 
 TBD